PROCEDE DESTINE A AUGMENTER LA RESISTANCE A LA CORROSION DES ACIERS-CHROME-NICKEL AUSTENITIQUES

摘要

A process is described for enhancing the corrosion resistance of austenitic stainless steels which are exposed to solutions containing ammonium carbamate. The process involves exposing the surfaces of such stainless steel equipment, which are exposed to ammonium carbamate solutions during, e.g., the commercial manufacture of urea and melamine, to the corrosive effects of such solutions for a period of time to induce significant corrosion of such surfaces, followed by contacting said surfaces at a temperature of at least about 100 DEG C for a period of time with an oxidizing agent.